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Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof

A nitrobenzene wastewater, catalytic oxidation technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of unacceptable, slow nitrobenzene degradation and high cost , to achieve the effect of ensuring compliance with emission standards

Inactive Publication Date: 2012-05-09
广东华凯明信科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

However, studies have shown that if any oxidation method is used alone to treat nitrobenzene wastewater, the degradation rate of nitrobenzene is slow and the cost is high, which is difficult for enterprises to accept

Method used

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  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof
  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof
  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof

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Experimental program
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Effect test

Embodiment 1

[0038] In terms of weight percentage, based on activated carbon and iron filings accounting for 98% of the electrode particles, 0.01% platinum oxide, 0.02% palladium oxide, 0.1% nickel oxide, 0.2% cobalt oxide, 0.3% Zinc oxide, 0.37% copper oxide and 1% manganese dioxide are used as solid catalysts, and activated carbon or / and iron filings and solid catalysts are fully mixed to form particle electrodes with a particle size of 4-6mm as electrodes; cathode electrode plates Graphite is used, the anode electrode plate is made of RuO 2 -IrO2 -TiO 2 / Ti, as the feeding electrode, the initial pH of nitrobenzene wastewater is 3, the distance between the plates is 6cm, the cell voltage is 30V, Fe 2+ The dosage is 1.0g / L (add in 6 times), the aeration volume is 0.8m 3 Under the condition of COD 18000mg / L and nitrobenzene content 1300mg / L, the nitrobenzene wastewater was treated for 90 minutes, and the removal rates of COD and nitrobenzene were 93.1% and 96.5%, respectively.

[0039] ...

Embodiment 2

[0041] Based on activated carbon and iron filings accounting for 94% of the electrode particles, 0.01% platinum oxide, 0.02% palladium oxide, 0.2% nickel oxide, 0.3% cobalt oxide, 0.47% Zinc oxide, 1% copper oxide, and 4% manganese dioxide are used as solid catalysts, and active carbon or / and iron filings and solid catalysts are fully mixed to form particle electrodes with a particle size of 4-6mm as working electrodes; cathode electrodes The plate is made of graphite, and the anode electrode plate is made of RuO 2 -IrO 2 -TiO 2 / Ti, as the feeding electrode, the initial pH of nitrobenzene wastewater is 2, the distance between the plates is 4cm, the cell voltage is 20V, Fe 2+ The dosage is 0.8g / L (add in 4 times), the aeration volume is 0.6m 3 Under the condition of COD 3440mg / L, the rosin production wastewater was treated for 90 minutes, and the removal rate of COD was 82.5%.

Embodiment 3

[0043] In terms of weight percentage, iron filings accounting for 96% of the electrode particles are used as the substrate, and 0.01% of platinum oxide, 0.02% of palladium oxide, 0.2% of nickel oxide, 0.3% of cobalt oxide, and 0.47% of zinc Oxide, 1% copper oxide and 2% manganese dioxide are used as solid catalysts, and activated carbon or / and iron filings and solid catalysts are fully mixed into particle electrodes with a particle size of 4-6mm as the working electrode; activated carbon or / Fully mix with iron filings and solid catalyst to form a particle electrode with a particle size of 4-6mm as the working electrode; the cathode electrode plate is made of graphite, and the anode electrode plate is made of RuO 2 -IrO 2 -TiO 2 / Ti, as the feeding electrode, as the feeding electrode, at the initial pH of 4, the distance between the plates is 8cm, the cell voltage is 40V, Fe 2+ The dosage is 1.2g / L (add in 5 times), the aeration volume is 1.0m 3 Under the condition of COD 2...

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Abstract

The invention belongs to the technical field of treatment of high concentration organic waste water, and particularly relates to a method for degrading nitrobenzene waste water by a polyphase electrocatalytic oxidation process. The invention solves the problems of high cost and long time consumption in the traditional nitrobenzene waste water methods, low efficiency and high energy consumption inthe electrolytic process, high oxidant consumption, high cost and the like in the Fenton process in the prior art for treating high concentration nitrobenzene water waste. The invention mainly adoptsthe catalytic oxidation action of transition metal catalysts in the electric field, and combines the Fenton process, thereby effectively degrading the high concentration nitrobenzene waste water. Themethod comprises the following steps that: (1) heterocatalytic reagents (solid catalysts) and particle electrodes, mainly including active carbon, and transition metal oxides and salts, are used for avoiding economic loss and secondary pollution to the environment, which are caused by catalyst loss in heterocatalytic oxidation; (2) under the condition of low pH value of the waste water in cooperation with Fe2+ with strong reducibility, a coupling reactor composed of an electrolysis field and oxidation reaction is used for generating chain reaction for generating an OH hydroxyl free radical, and the OH hydroxyl free radical can carrying out nonselective oxidization on organic substances, thereby finally oxidizing organic pollutants into carbon dioxide and water; (3) by using electric energy as an excitation energy and using cheap air as raw material, nitrobenzene substances in waste water are efficiently degraded under the coupling action of the polyphase electrocatalytic oxidation process and the Fenton process; (4) and the reactor is composed of a direct current regulated power supply, a feed electrode and an electrolytic bath.

Description

Technical field: [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and specifically relates to a process method for advanced oxidation degradation of nitrobenzene wastewater, which adopts the synergistic effect of multiphase electrocatalytic oxidation technology and Fenton method. Background technique [0002] Nitrobenzene wastewater contains a large amount of nitrobenzene, nitroaniline, o-nitrotoluene, o-nitromethanol and other substances. These nitrobenzene derivatives have extremely high stability in water and are generally considered difficult to biodegrade It is not even biodegradable. With the development of pharmaceutical, chemical, dyestuff and other industries, there are more and more high-concentration refractory nitrobenzene wastewater, and their treatment has become a major difficulty in wastewater treatment. This type of wastewater has poor treatment effect with traditional treatment techniques, which has become a difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/72
Inventor 肖凯军王新银玉容熊璞周显宏
Owner 广东华凯明信科技有限公司
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